The Geminid shower appears in the night sky each December as the Earth passes through the debris left behind by an asteroid.
The best viewing should be overnight from December 13th into the early hours of December 14th.
Pick a spot with a wide view of the sky, no cloud cover and far from city lights.
Give your eyes about 30 minutes to adjust.
The Planetary Society says:
“Typically the best time to see a meteor shower is between midnight and pre-dawn, because that’s when you are on the leading side of the Earth, watching the comet debris come at you like rain hitting a car windshield,”
A full moon might mess up your view so go after the moon sets